Report: 35 million-plus worldwide have dementia

The report urges the World Health Organization to declare dementia a health priority and for national governments to follow suit. It recommends major new investments in research to uncover what causes dementia and how to slow, if not stop, the creeping brain disease that gradually robs sufferers of their memories and ability to care for themselves, eventually killing them.

There is no known cure; today's drugs only temporarily alleviate symptoms. Scientists aren't even sure what causes Alzheimer's.

But major studies under way now should show within a few years if it's possible to at least slow the progression of Alzheimer's by targeting a gunky substance called beta-amyloid that builds up in patients' brains, noted Dr. William Thies of the U.S. Alzheimer's Association. His group is pushing for an increase in U.S. research spending, from just over $400 million to about $1 billion.